Arrangement in calenders



Jan. 20, 1959 o. H. PETTERSON 2,869,258

' ARRANGEMENT IN CALENDERS FiledjApril 21, 1955 s Sheets-Sheet 1 FIG. 7.

1. N Inventor '.H.Pe25tr som/ J 1959 b. H. PETTERSON 2,369,253

ARRANGEMENT IN CALENDERS 5 Sheets-Sheet 2 Filed April 21, 1955 llIIIIII/IIIIII ll/11111111111 111i,

FIG. 4.

0. H: PETTERSON ARRANGEMENT IN CALENDERS Jan. 20, 1959 s Sheets-Sheet 3 Filed April 31, 1955 8 QIH IOW IH I IMHI HUI UNHM HUH FIG. 5;

IIIIIIIIIIIIIIIIL ARRANGEMENT IN CALENDERS Olof Holger Petterson, Bromma, Sweden Application April 21, 1955, Serial No. 502,944

' 1 Claim. or. 38-56) V 'The present invention relates to flat work ironers and particularly to the chest forming the bed for the roll of such ironers. Steam orother heating medium is supplied to the chest for heating the ironer shoe, which partially encloses the roller.

In.previously known devices of this kind, numerous difficulties have been experienced on account of tendencies of 'the chest upon heating to be deformed in such a manner that the ironer shoe does not fit the form of the roll. In such cases, said roll will load the ironer shoe along areas uncontrollable with regard to their shape. The ironing becomes incomplete, and the material being ironed has to be fed through the machine repeatedly. Above all, a distortion of the chest causes, however, the disadvantage that the material being ironed is advanced irregularly, and hence wrinkling may result. Several pro- Patented Jan. 20, 1959 "ice which constitutes the ironer shoe and is substantially semipos als have been made for avoiding the above-mentioned inconveniences, but theseproposals generally are directed to devices for controlling the pressure between roller and chest, mainly in order to eliminate the defective contact of the roller with the ironer shoe. However, such measures have not met with success, since they do not attack the actual source of errors, namely the deformation of the chest, above all by distortion.

One object of the invention is to obtain a design for the chest, permitting a thermal expansion without the risk of distortion. This has mainly been obtained owing to the fact that the chest is provided with mutually parallel end Walls and partitions arrangedas transverse structural elements, preferably of uniform strength, said elements being, by welding, connected both to the ironer shoe and to the bottom of the chest, which bottom follows, in cross section, a circular line or a polygon, the centre of curvature of which is located in the same direction as that of the ironer shoe.

The invention will now be described more fully with reference to the accompanying drawings, in which:

Fig. 1 is a vertical section taken on the line 1-1 in Fig. 2.

Fig. 2 is a front view of the machine.

Fig. 3 is an axial section on a larger scale through one end portion of the roll, showing a universal joint for driving said roll.

Fig. 4 is a cross section taken on the line 4-4 in Fig. 6.

Fig. 5 shows the chest as viewed from below.

Fig. 6 is a side view of the chest partial in longitudinal section.

In the embodiment shown the mangle comprises a roll 1, which is rotatable on a chest 2 forming a bearing for the roll. Said roll 1 is provided with a central body 3 and is built in known manner with perforated outside casing 4 covered with a textile fabric pad. At one end wall, said roll is provided with a hub sleeve 5 connected to the suction side of a fan 6 producing suction for the purpose of removing moisture from the clothes during the ironing operation. The opposite end wall of the roll is provided with a hub sleeve 7, which forms a coupling sleeve having axial grooves 8 and accommodates a cross cylindrical and has a radius corresponding to that of the roll. The ironer shoe. 14 is along its longitudinal edge portions bent away-from the roll and forms togetherwith this latter feed in and discharge openings for the material.

According to the example, the chest is provided with a substantially semi-cylindrical bottom 15 having generally the same radius of curvature as that of the shoe 14. Two end walls 16 seal the space between the shoe and the bottom so that a steam chamber is formed, to which steam may be supplied through a short fixed pipe 17 extending upwardly through the bottom 15 towards the shoe 14 at the lowest part of the latter. As a result, water of condensation is prevented from accumulating in the steam inlet. The water of condensation is discharged through an outlet 18 connected to a water collecting tank.

The steam passes through the chest in its longitudinal direction and those parts of the shoe 14, from which the largest amount of heat is removed, cause an increased condensation and thus an increased supply of heat. The steam pressure of the steam supplied is in the range of 7 to 8 atmospheres, the working temperature of the chest thus reaching about C., which involves considerable expansions of the various parts of the chest when they are heated from room temperature.

With regard to even contact of the roll, it is of very great importance that the chest should maintain its shape during temperature variations so that no distortion ensues.

According to the invention, a chest has been built, which in practice has proved to be thoroughly satisfactory from said point of view. The roll rotates with the same smooth action both when the chest is cold and when it is hot, and the contacting pressure of the roll against the material is evenly distributed throughout the roll surface. Only in this way an effective mangling is obtained.

In operation, the chest is brought to a temperature considerably higher than that of the casing 4 ofthe roll. Under such circumstances, said casing 4 expands in a smaller degree than the shoe 14. However, the radius of curvature of the shoe should correspond to the radius of the roll, i. e., the shoe 14 should, during heating, be bent in such a manner that the radius increases only in proportion to that of the roll. The essential thing is, however, that the thermal expansion does not cause dis tortion of the ironer shoe.

The chest is provided with transverse structural elements consisting of partitions 20 of the .same thickness as that of the end walls 16. By welding, the partitions 20 are connected to the shoe 14 as well as to the bottom 15 of the chest, and they extend substantially along the entire transverse dimension of said cylindrical walls, with the exception of uncovered passages 21 for the steam, situated at the highest portions of the chest. Thus, the steam may be introduced into a'chamber 22 disposed, according to Fig. 6, nearest the lefthand end wall 16, said chamber being closed in the other direction by the nearest partition 20, and may pass therefrom through the two passages 21 at the edges of the chest into the next chamber 22, and so on. For the purpose of collecting the water of condensation and drawing it off through the bottom outlet 18, all of the partitions 20 are formed with a small recess 23 in the lowest part of the chest so that the water of condensation may pass from one chamber 22 to the other and further to the bottom outlet.

The end walls and the partitions are primarily attached to the ironer shoe by means of welded joints 24 extending on either side of each wall. The end walls 16 have a greater width than the partitions 20 so as to project beyond the bottom. Their outer contour follows an arc concentric with the cylindrical bottom 15. Thus, the bottom plate may bewelded to the inside of the .end Walls by means of welded joints 25. For the purpose of 'welding together the bottom 15 and the partitions .20, the bottom is provided witha series of holes 26 for each partition, as appears from Figs. 4 and 5, distributed over the edge surface of the partition. Consequently, after the bottom has been welded to the end walls .16, the partitions 20 are accessible for welding through the holes 26, which are filled up by so-called plug welding, the bottom thus being rigidly secured to the partitions and deformable with the same due to temperature changes.

Each end wall 16 is provided, on the outside, with a bracket 27 intended for mounting the chest in stand walls 28 and 29, which are each provided with a corresponding bracket 30. A plate 31 is fixed under tension around the outer edge of the end walls 16 and closes a space 32 (Fig. 6) along the outside of the bottom 15. This space is filled with a heat insulating material 33, preferably glass wool or the like, thereby preventing radiation of heat from the bottom surface 15.

Each end wall of the chest 11 is provided with a valved outlet 34, which outlets are kept open merely during-the first part of the steam supply, so that the air is allowed 'to escape from the chest, and are subsequently closed.

Because of the fact that in operation the shoe .14 is maintained at a lower temperature than the bottom '15, forces are produced, which tend to reduce the radius of curvature of the shoe. Thus, said forces operate in a favourable sense and in consideration of said efiect, the partitions may be dimensioned in such a manner that the same have a certain yielding ability.

According to the embodiment shown the partitions are arranged at a distance from each other shorter than the height of the chest, thus dividing the chest into a plurality of chambers 22. The-end walls 16 have a moment of inertia greater than that of the partitions. The thickness of these latter is approximately twice that of the shoe 14 and approximately three 'times that of the bottom 15.

What I claim is:

In a machine of the character described, a sealed chest including a substantially semi-cylindrical ironer shoe and a substantially semi-cylindrical bottom spaced therefrom and having substantially the same radius of curvature as the ironer shoe, parallel end walls arranged perpendicularly to the longitudinal axis of the ironer shoe and bottom closing the chest, means to introduced a heating medium into the chest to heat the same, a roll resting in and rotatable with respect to the ironer shoe, means connecting the roll with a source of power, a plurality of spaced apart transverse partitions arranged within the chest in parallelism to the end walls, weld means securing the partitions to the ironer shoe and to the semi-cylindrical bottom whereby the bottom deforms with the partitions due to temperature changes, a heat insulating cover means on the bottom of the sealed chest, and each of said partitions being provided with at least one passage adjacent the ironer shoe to allow theheating medium to flow into the compartments within the chest defined by adjacent partitions.

References Citedin the file of this patent UNITED STATES PATENTS 683,402 Hoyt Sept. 24, 1901 FOREIGN PATENTS 983,699 France Mar. 25, 1949 

